It could be as mundane as a member of the Jury was caught reading external news services.
Jury Tampering is only ONE option.
MORGAN: Why didn't you fight him at the park if you wanted to? I'm not goin' now, I'm eatin' my snack. CHUCKIE: Morgan, Let's go. MORGAN: I'm serious Chuckie, I ain't goin'. WILL: So don't go.